id:A067636 - OEIS Search Results

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Row 1 of table in A067640.

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2, 20, 210, 2352, 27720, 339768, 4294290, 55621280, 734959368, 9873696560, 134510127752, 1854385377600, 25828939188000, 362995937665200, 5141806953167250, 73343003232628800, 1052697272275341000 (list; graph; listen)

	OFFSET	`0,1`
	LINKS	`J. L. Jacobsen and P. Zinn-Justin, A Transfer Matrix approach to the Enumeration of Knots`
	FORMULA	`a(n) = (2n)!(2n+2)!/((n-1)!((n+1)!)^2*(n+2)!).`
	MAPLE	for n from 1 to 30 do printf(`%d, `, (2n)!(2*n+2)!/(n-1)!/(n+1)!^2/(n+2)!) od:
	CROSSREFS	`Adjacent sequences: A067633 A067634 A067635 this_sequence A067637 A067638 A067639` `Sequence in context: A037729 A037624 A077327 this_sequence A000906 A127110 A109106`
	KEYWORD	`nonn,easy`
	AUTHOR	`njas, Feb 05 2002`
	EXTENSIONS	`More terms and Maple code from James A. Sellers (sellersj(AT)math.psu.edu), Feb 11, 2002`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.

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